4diiii power meter crank - over reading?

Hendrix2430

Hi All

Just got a 4iiii crank for my bike - took it out for a 30mn spin and I think there is something wrong...

I've done FTP tests on Zwift and Trainerroad with an Elite Trainer (with Misuro B+ unit), and outside I am using the Strava Iphone App and its estimated power...not ideal I realise this, but surprisingly all of them were kind of similar.

But this time, I connected the 4iiii power meter to Strava to test it, and my average power was 380W for the ride...thats waaaay too high I think!!! That's like 6.5W/kg!

On the 4iiii app there you can change the wheel circumference - currently it is set at 2070. I run Fulcrums 700C X 25mm...

Should I change the wheel circumference to 2105 for this size wheel/tyre? (as it is recommended by several head unit manufacturers on their devices)? There isn't this option on Strava...

Thank you for the advice, I must say I'm a bit at a loss here...Cheers!

jgsi

Calibrated - zero offset?

http://4iiii.com/wp-content/uploads/201 ... 0123-1.pdf
Page 15

Hendrix2430

Yes I did that on the 4iiii app. No issues

Maybe the wheel circumference thing?

jgsi

Cant see how a strain gauge needs to know subtle difference between wheels, I'm afraid.
I think you need to do some further testing with it on the turbo.
Use an ANT+ headunit for the data collection.... not rely on Strava for detailed troubleshooting.

Hendrix2430

Cheers, I'll try that.

kesa

Did you use a torque wrench to put it on?

Hendrix2430

Yes installed with a torque wrench

redvision

Check you have the latest updates installed and that you do not include zeros in the average.
If still experiencing high readings i would contact 4iiii.